Let’s try to apply practice from criminal law, as we lack any other means of proof, but first, let’s define what rigging in this case really means.
Step 1: Defining “rigging”
Based on Merriam-Webster dictionary, “rigging” is a slang term which means:
Manipulating or controling usually by deceptive or dishonest means
OK, that’s a nice start.
Step 2: Accusations:
Step 2 in criminal law is providing accusations. In our case, we have a couple of different accusations flying around:
Accusation 1: Blizzard has (and uses) a patent which matches players who have a skin for some weapon in CoD with players who don't and puts them into a map which is favorable for players who use a weapon for which they want to sell the skin of. The accusation goes on to say that they do this to get more money, and that they use that patent on Hearthstone, as well, although Blizzard says they never even used it on CoD.
Accusation 2: Blizzard uses deceptive matchmaking to match players based on their counters, to make them spend more money in the game because they lose too much.
Accusation 3: Blizzard uses deceptive matchmaking based on deck construction to reward more expensive decks to motivate people to buy those cards/decks.
In all cases, intent and exists. Now, we have to prove they also had the means and the motive to do that.
Step 3: Motive
Accusation 1 motive: Sell more weapons/cards in this case - check. The motive exists.
Accusation 2 motive: Sell more cards + make players spend more time playing - check. The motive exists.
Accusation 3 motive: Sell more cards + make players spend more time playing - check. The motive exists.
Step 4: Means
Accusation 1 means: No way to push selling cards that way because there are no maps where certain cards/weapons are more favorable to win - Means nonexistant.
Accusation 2 means: It's impossible to match players on average more against their counters, because this game is a zero-sum game, so when someone gets matched with their counter, the other person gets matched with the deck they counter. In overall, it cancels out.
Accusation 3 means: It's impossible to achieve selling more of some cards with deceptive **matchmaking** because the game also depends on the skills of the pilot, so the skills determine the cards' functionality. Also, RNG nature of the game makes the cards less able to achieve this because they sometimes don't get drawn or sometimes don't work as intended in certain matchups.
However, it IS possible to achieve step 3 by intentionally designing and dropping broken cards to push sales of those cards, and nerfing them afterwards. It technically does mean the game is “rigged” like that, but it has nothing to do with matchmaking AND it doesn’t serve the INTENT of the accusation, because once nerfed, the cards can be disenchanted for full value back.
Also, it’s possible to achieve intent number 3 by using RNG, which we all know and accept as a part of the game. RNG will lead to more playtime because:
a) A player keeps switching between winning and losing, which prolongs their grind, and
b) Variablity of RNG naturally gets people addicted to the game, as they know they will win and get their dopamine shot, but they don’t know when that’s going to happen.
In this case, it’s normal and accepted, and it’s the reason why we all play the game at all.
Conclusion: Matchmaking is not rigged. Deceitful business practices used aren't illegal nor damage the players' agency. People who know all this and still BELIEVE the matchmaking is rigged, are wrong and most likely have mental issues.
By rigging the game, you’d actually have the counter-effect:
a) People would lose more than random, and leave because they wouldn’t get addicted to the game, or
b) The game would be unbalanced, thus also causing people to leave the game because they refuse to play a certain deck or a playstyle, so you have to shuffle and vary what is broken from time to time, thus making it fair and balanced.
It’s literally impossible for anyone who thinks otherwise to prove this post wrong because the very motives and intents which they use as a proof are the reason why it isn’t so. It’s a paradox, and checkmate. It’s not a matter of belief. It’s a matter of cognitive and mental health.